nektons'

nekton

[nek-ton, -tuhn]
noun
the aggregate of actively swimming aquatic organisms in a body of water, able to move independently of water currents.

Origin:
1890–95; < German, noun use of neuter of nēktós swimming (verbid of nḗchein to swim; see nectopod)

nektonic, adjective
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World English Dictionary
nekton (ˈnɛktɒn)
 
n
Compare plankton the population of free-swimming animals that inhabits the middle depths of a sea or lake
 
[C19: via German from Greek nēkton a swimming thing, from nēkhein to swim]
 
nek'tonic
 
adj

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
nekton  [%PREMIUM_LINK%]     (něk'tən, -tŏn')  Pronunciation Key 
The collection of marine and freshwater organisms that can swim freely and are generally independent of currents, ranging in size from microscopic organisms to whales. Compare benthos, plankton.

The American Heritage® Science Dictionary
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